CSH Reg-Ex Matching Help

[lagdawg]

I have a CSH script in which it currently matches a number from 0-9 given by the user.

while( $varnum =~ [0-9])

I would like to not limit this to a one digit number. Would this line work:

while( $varnum =~ [0-9][0-9]*)

I interpret this as matching any input with one or more numeric characters. However, it seems to me that in a shell script this may be interperted as a 2 numeric characters then followed by any number of characters?

[lagdawg]

I have done some more work and for now I can use:

while ($varnum !~ [0-9] && $varnum !~ [0-9][0-9])

in order to force the user to enter a 1 or 2 digit number.

However, there must be a way to easily check for a number with any number of digits in a C - Shell script.

Anybody have any ideas?